ch = load('BFP_10.txt');
xh = ch(:,1);

for i=1:256

    e = (xh(i)./256)*(4);
    xh(i)= 10^(-1+e);
    
end

dh = ch(:,2);
ch = floor(ch(:,2)./10);
ch = ch.*10;
semilogx(xh,ch,'r');
hold on
semilogx(xh,dh,'b');